Is OpenSearch or PostgreSQL better?

Neither clearly leads. OpenSearch starts at Free and PostgreSQL at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.

Which is cheaper, OpenSearch or PostgreSQL?

OpenSearch starts at Free and PostgreSQL at Free.

Does OpenSearch or PostgreSQL run on more platforms?

OpenSearch runs on Linux, Docker, Kubernetes, Self-hosted. PostgreSQL runs on Linux, Windows, macOS, BSD, Unix.

Can I use OpenSearch for free?

Both have a free tier, so you can try either at no cost before committing.

What is OpenSearch best used for?

OpenSearch is most often used for log and observability storage where an apache-2.0 licence is a requirement, replacing elasticsearch after the licence change without changing architecture, search plus analytics on one cluster rather than two systems. Of those, log and observability storage where an apache-2.0 licence is a requirement and replacing elasticsearch after the licence change without changing architecture are not what PostgreSQL is typically brought in for.

What can OpenSearch do that PostgreSQL cannot?

OpenSearch covers Full-text search, OpenSearch Dashboards, Log analytics, Vector search. PostgreSQL covers ACID Compliance, JSON/JSONB Support, Full-text Search, Extensibility.

Databases · head to head

OpenSearch vs PostgreSQL

OpenSearch

Databases

Open-source search and analytics suite forked from Elasticsearch

From: Free
Rated: -

Full review Website

PostgreSQL

Databases

The world's most advanced open source relational database

From: Free
Rated: -

Full review Website

The short version

Each has a real cost: OpenSearch diverged from Elasticsearch since 7.10, so clients, plugins and features no longer map one to one; PostgreSQL requires manual scaling across multiple machines for very large deployments
They diverge on capability: OpenSearch covers Full-text search, PostgreSQL covers ACID Compliance.

Where they differ

Only the attributes on which OpenSearch and PostgreSQL actually diverge.

Attributes where OpenSearch and PostgreSQL differ
Attribute	OpenSearch	PostgreSQL
Pricing model	Open source, no licence fee; managed services billed separately	Unknown
Platforms	Linux, Docker, Kubernetes, Self-hosted	Linux, Windows, macOS, BSD, Unix
Founded	Unknown	1996

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Databases).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in OpenSearch

Full-text search
OpenSearch Dashboards
Log analytics
Vector search

Only in PostgreSQL

ACID Compliance
JSON/JSONB Support
Full-text Search
Extensibility
Advanced Indexing
Partitioning
Replication
pgAdmin

What people use each for

The jobs each tool is most often brought in to do.

OpenSearch

Log and observability storage where an Apache-2.0 licence is a requirementnot PostgreSQL
Replacing Elasticsearch after the licence change without changing architecturenot PostgreSQL
Search plus analytics on one cluster rather than two systemsnot PostgreSQL

PostgreSQL

Transaction processingnot OpenSearch
Data storagenot OpenSearch
Application backendnot OpenSearch
Reportingnot OpenSearch
Data analyticsnot OpenSearch

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

OpenSearch

Diverged from Elasticsearch since 7.10, so clients, plugins and features no longer map one to one
Operationally heavy in the way Elasticsearch is: cluster sizing, shard strategy and JVM tuning are ongoing work
Smaller ecosystem of third-party tooling than Elasticsearch, which most integrations still target first
Overkill for plain application search, where a dedicated search engine is far simpler

PostgreSQL

Requires manual scaling across multiple machines for very large deployments
Performance tuning requires deep knowledge of database internals
No built-in graphical admin interface; command-line tools are primary method

Pricing, plan by plan

OpenSearch

Free

OpenSearchFree
- Full functionality
- Self-hosted
- No usage limits

PostgreSQL

Free

No published plan breakdown. See the PostgreSQL review.

Which should you pick?

Choose OpenSearch if

You need full-text search.
You want to start without paying.
You work on Linux, Docker, Kubernetes, Self-hosted.
You also want opensearch dashboards.

OpenSearch review

Choose PostgreSQL if

You need acid compliance.
You want to start without paying.
You work on Linux, Windows, macOS, BSD, Unix.
You also want json/jsonb support.

PostgreSQL review

Questions people ask

Is OpenSearch or PostgreSQL better?: Neither clearly leads. OpenSearch starts at Free and PostgreSQL at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, OpenSearch or PostgreSQL?: OpenSearch starts at Free and PostgreSQL at Free.
Does OpenSearch or PostgreSQL run on more platforms?: OpenSearch runs on Linux, Docker, Kubernetes, Self-hosted. PostgreSQL runs on Linux, Windows, macOS, BSD, Unix.
Can I use OpenSearch for free?: Both have a free tier, so you can try either at no cost before committing.
What is OpenSearch best used for?: OpenSearch is most often used for log and observability storage where an apache-2.0 licence is a requirement, replacing elasticsearch after the licence change without changing architecture, search plus analytics on one cluster rather than two systems. Of those, log and observability storage where an apache-2.0 licence is a requirement and replacing elasticsearch after the licence change without changing architecture are not what PostgreSQL is typically brought in for.
What can OpenSearch do that PostgreSQL cannot?: OpenSearch covers Full-text search, OpenSearch Dashboards, Log analytics, Vector search. PostgreSQL covers ACID Compliance, JSON/JSONB Support, Full-text Search, Extensibility.

Answered from the vendors’ own pages

OpenSearch: Is OpenSearch free?

Yes, Apache 2.0 licensed under the Linux Foundation. Amazon OpenSearch Service is a paid managed option.

PostgreSQL: Is PostgreSQL completely free?

Yes. PostgreSQL is completely free and open source with no licensing fees or restrictions on use.

Source

OpenSearch: Why does OpenSearch exist?

Elastic moved Elasticsearch off the Apache 2.0 licence in 2021. AWS forked the last Apache-licensed version, and the project now sits under the Linux Foundation.

PostgreSQL: What platforms does PostgreSQL run on?

PostgreSQL runs on all major operating systems including Linux, Windows, macOS, BSD, and commercial Unix variants, and has been proven highly scalable managing terabytes to petabytes of data.

Source

OpenSearch: Is OpenSearch compatible with Elasticsearch?

It was at the 7.10 fork point. Both have developed independently since, so compatibility weakens with every release and should be verified for the features you use.

PostgreSQL: What procedural languages are supported?

PostgreSQL supports stored functions and procedures in multiple languages including PL/pgSQL, Perl, Python, Tcl, Java, JavaScript, R, and Rust.

Source

PostgreSQL: What is ACID compliance in PostgreSQL?

PostgreSQL has been ACID-compliant since 2001, ensuring data integrity through atomicity, consistency, isolation, and durability guarantees for all transactions.

Source

PostgreSQL: Does PostgreSQL support JSON data?

Yes. PostgreSQL supports JSON and JSONB data types for storing and querying JSON documents, along with XML and other document formats.

Source

OpenSearch vs PostgreSQL

OpenSearch

PostgreSQL

The short version

Where they differ

What each one covers

Only in OpenSearch

Only in PostgreSQL

What people use each for

OpenSearch

PostgreSQL

Where each one falls short

OpenSearch

PostgreSQL

Pricing, plan by plan

OpenSearch

PostgreSQL

Which should you pick?

Choose OpenSearch if

Choose PostgreSQL if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on OpenSearch

More on PostgreSQL

Keep looking

Other head to heads